Adjustable eccentric



Feb. 9, 1943 S. l. BOUSMAN ADJUSTABLE ECCENTRIC Filed March 31, 1942ZSheets-Sheet 1 s g 4, O

5 g 35' Ila 27 I3 H 6 i 38 53 10a '24 51 H v l v I FIG. I- III 4AM L e 34-6 [I "I; v v

, 6 SAMUEL 1. BOUSMAN,"

INVENTOR.

ATTORNEY Feb. 9, 19 43. s. BQU MAN 2,310,209

ADJUSTABLE ECCENTRIC Filed March 31, 1942 2 Sheets-Sheet 2' FIG. 4. 16

SAMUEL BOUSMAN,

INVENTOR.

ATTORNEY Patented Feb. 9, 1943 ADJUSTABLE ECCENTRIC Samuel 1. Housman,San Francisco, Calif., as-

signor to Western'Machinery Company, San Francisco, Calif, a corporationof Utah Application March 31, 1942, Serial No. 436,999

4 Claims.

be able to adjust the throw or eccentricity of such mechanisms.

Adjustable eccentrics are employed in various machines and applicantdoes not claim to be the inventor of such mechanism in its broadestsense but only of a specific embodiment thereof.

It is the object of this invention to produce an adjustable eccentric ofa simple and substantial construction that can be applied to the end ofa shaft and have readily accessible means for effecting adjustment.

Another object is to produce an adjustable eccentric in which theeccentric strap is formed from a single piece of metal.

A further object is to produce an adjustable eccentric in which theadjusting mechanism is formed in part by a threaded pin that does notrotate about its axis during the adjustment and which can therefore beremovably attached to a one-piece eccentric disk after the latter is inits proper position and a still further object is to produce anadjustable eccentric in which adjustments for wear can readily beeffected and which can therefore always be kept in such adjustment thatit will operate silently and without knock.

The above and any other objects that may become apparent as thisdescription proceeds are attained by means of a construction and anarrangement of parts that will now be described in detail and for thispurpose reference will be had to the accompanying drawings in which theinvention has been illustrated in its preferred form, and in which:

Figure 1 is a diametrical section taken on line l-l, Figure 2;

Figure 2 is an end view looking in the direction of arrow 2 in Figure 1;

Figure 3 is a transverse section taken on line 3-3, Figure 1;

Figure 4 is a side elevation of the eccentric shaft, a portion thereofbeing a section taken on line 44, Figure 6;

Figure 5 is an end view looking in the direction of arrow 5, in Figure4; and

Figure 6 is a fragmentary side elevation looking in the direction ofarrow 6, in Figure 4.

In the drawings reference numerals l0 and H indicate portions of a pumpframe. The pump has not been illustrated because the invention relatesto the adjustable eccentric and is enscrew ll.

tirely independent of the machine with which it is employed. The framemembers II] and H are provided with bearings la and Ila in which isjournaled a shaft l2. This shaft has been shown as having a cylindricalportion l3 that is journaled in bearing Illa and a cylindrical portion Mof somewhat larger diameter that is journaled in bearing Ila. A sprocketwheel [5 is shown positioned between the bearings lfla and i la and heldin position by a feather key l6 and a set The end of the shaft 12, tothe right as shown in Figure l, is enlarged to form an eccentric headthathas been designated by reference numeral I1 and which is illustratedin detail in Figures 4, 5 and 6. Referring to Figure 4, line ABdesignates the axis of shaft 12 and line C-D designates the axis of theopening H3 in head H. The inner wall of opening'l8 is provided withchordal abutment surfaces It and 20 shown more particularly in Figure 5.The abutment surfaces are parallel and preferably perpendicular to aplane containing the axes AB and 0-D. Head I1 is preferably cylindricalon its outer surface and is provided with flattened surfaces 2| and 22that are parallel respectively to surfaces It and 20. The wall portionsbetween surfaces l9 and 20 and between surfaces 20 and 22 are providedwith openings 23, Figure 4, that are axially aligned and positioned withtheir common axis in a plane containing axes AB and C-D. At least one ofthe radial openings 23 is threaded. In Figure 4, both openings 23 havebeen shown threaded and positioned in each opening 23 is an adjustableabutment sleeve 24. Sleeves 24 are provided with cylindrical unthreadedopenings for the reception of a pin 25 that is provided on its outersurface with square threads, as shown in the drawings. A nut 26 ispositioned between the inner ends of the abutment sleeves 24 and isthreaded for cooperation with the threads on pin 25. A bevel gear 21 issecured to one end of the nut 26, preferably by a pressed fit, so as tobe nonmovably connected with the nut. Opening 18 is closed by means of acap or bracket 28 having'a flange 29 that is perforated for thereception of the cap screws 30. Cap 28 has a bearing 3| that is in axialalignment with axis AB. A shaft 32 is rotatably mounted in bearing 3|and has attached to its inner end a bevel gear 33 that is positioned tocooperate with bevel gear 21. A hand wheel 34 is secured to the outerend of shaft 32 and held against movement relative to the shaft by meansof a pin 35. The hub portion 36 of cap 28 is provided with a depressionor a plurality of depressions 3'! with which the spring pressed ball 38cooperates to form stops that hold the parts in adjusted position.Surrounding head I! is an eccentric disk 39. This disk is formed from asingle piece of metal and is provided on its outer surface with acircular depression 40 for the reception of the eccentric strap 4|.Eccentric disk 39 has two axially aligned openings 42 and 43 of theproper size to receive the ends of threaded pin 25. The upper end of pin25, when seen as in Figure 3, has an unthreaded cylindrical portion 43and this end of the pin and the corresponding part of the eccentric diskare perforated for the reception of a holding pin 44. Pin 44 preventsthe threaded pin from moving either axially or rotatably in opening 42.The eccentric strap 4| is made in two parts which are held in assembledrelation by means of bolts 45. A connecting rod 45 is threadedly securedto the hub 41 that projects downwardly from the lower half of theeccentric strap. A lock nut 48 serves to hold the connecting rod inadjusted position. Head I1 is provided with a flange 49 that isconcentric with the axis of shaft l2.

Assuming now that the apparatus above described is constructed in themanner shown, it is evident that whenever the handwheel is rotated aboutthe axis of shaft 32, it will rotate bevel gear 2'! and turn the nut 26relative to pin 25. Since nut 26 is held against longitudinal movementby the abutment sleeves 24, pin 25 will move axially, thereby shiftingthe eccentric disk 39 with respect to the axis of shaft l2. Theeccentric is so constructed that disk 39 can be moved into a position inwhich its outer surface is concentric with shaft E2 or into a positionin which the outer surface is eccentric with respect to the shaft. Theamount of this adjustment will depend on the size and specificrelationship of the parts. Whenever the ends of the nut and thecooperating abutment surfaces of sleeves 24 Wear to any appreciableextent the sleeves can be rotated, thereby bringing them into properadjustment with the nut and in this manner adjustments can be effectedto compensate for wear with the result that the eccentric will rotatenoiselessly and without knocking. Sleeves 24 are secured in adjustedposition by means of set screws 50 as shown in Figure 3.

Particular attention is called to the fact that in this construction theeccentric disk can be made in one piece and that adjustments for wearcan readily be effected in the manner above described.

Having described the claimed as new is:

1. An adjustable eccentric comprising a hollow head having alignedtransversely extending openings, an eccentric disk encircling the head,the eccentric disk having openings in alignment with the transverseopenings, a threaded pin extending through the head and positioned withits ends in the openings in the eccentric disk, means interconnectingthe pin and the disk to prevent both rotary and axial movement of thepin in the disk openings, a nut positioned in the hollow head andoperatively connected with the pin, thrust abutments engaging oppositesides of the nut for resisting movement in the direction of the axis ofthe pin, at least one of said thrust abutments being threadedlyconnected with the head to effect adjustment for wear and means forinvention what is turning the nut whereby the eccentric disk and. thepin can be moved relative to the head to change the eccentricity of thedisk.

2. An adjustable eccentric comprising a hollow head mounted for rotarymovement about an axis, one end of the head having an opening positionedto enclose the axis of rotation, the wall surrounding the openlng havingaligned transverse openings whose common axis intersects the axis ofrotation, at least one of the transverse openings being threaded, athreaded abutment sleeve positioned in the threaded opening, a threadedpin extending through the sleeve and the other transverse opening, aneccentric disk encircling the head, said disk having axially alignedopenings for the reception of the ends of the threaded pin, meansinterconnecting the pin and the eccentric disk to prevent both rotaryand axial movements, a nut positioned in the opening in the head andthreadedly connected with the threaded pin, a bevel gear on the nut,abutment means on opposite sides of the nut, one of said abutmentscomprising the threaded sleeve, and means for turning the nut comprisingan axially extending shaft, a bevel gear carried thereby, and means forturning the shaft.

3. An adjustable eccentric comprising, in combination, a hollow headmounted for rotation, the wall of the head having aligned radialopenings whose common axis intersects the axis of rotation, the radialopenings being threaded, a threaded abutment sleeve in each opening, athreaded pin extending through the transverse openings, a nut positionedin the hollow head and operatively connected with the threaded pin, abevel gear connected with the nut, means for turning the nut, comprisingan axially extending shaft and a gear in operative engagement with thegear on the nut, an eccentric disk surrounding the head, said diskhaving axially aligned openings for the reception of the ends of thethreaded pin, and a holding pin extending through the aligned openingsin the disk and the threaded pin to prevent the latter from turning andfrom moving axially relative to the eccentric disk.

4. An adjustable eccentric comprising in combination, a shaft having oneend enlarged to form a head and provided with an opening positionedeccentrically with respect to the shaft axis, the head wall havingaxially aligned radial openings whose common axis lies in a planecontaining the axis of the shaft and the center of the hub opening, athreaded pin extending through the radial openings, an eccentric diskenclosing the head, said disk having diametrically aligned openings forthe reception of the ends of the threaded pin, one end of the pin andthe eccentric disk having aligned openings, a. holding pin in the lastnamed openings, a nut on the threaded pin, positioned in the headopening, opposite sides of the nut abutting the inner surface of thehead wall, a bevel gear on the nut, a removable cap for the headopening, a shaft mounted for rotation in the cap, and a bevel gear onthe inner end of the last named shaft, in operative engagement with thegear on the nut, whereby when the gear carrying shaft is rotated the nutwill turn on the threaded pin and shift it axially.

SAMUEL I. BOUSMAN.

